Flanged printing plate



F. C. GOLDENBAUM FLANGED PRINTING PLATE Filed Sept. 8 1920 INVEIiITORmum's Patented May 20, 1924.

UNITED STATES PATENT OFF-ICE.

FREDERICK C. GOLDENBAUM, OF KEARNY, NEW JERSEY, ASSIGNOR TO INTERNA-TIONAL PRINTING PLATE COMPANY, INC., OF NEW YORK, N. Y., A CORPORATIONor NEW YORK.

FLANGED PRINTING PLATE.

Application filed September 8, 1920. Serial No. 409,010.

To (all whom it may concern:

Be it known that I, FREDERICK G. GOL- DENBAUM, a citizen of the UnitedStates, residing at Kearny, in the county of Bergen and State of NewJersey, have invented certain new and useful Improvements in FlangedPrinting Plates, of which the following is a specification.

This invention relates to printing plates of the type that is providedwith flanges by means of which the plates may be attached to suitablesupporting blocks.

It has heretofore been the practice in employing printing plates ofnon-metallic sheet material, such as celluloid, to provide two oppositeedges of the plate with flanges which were arranged either in paralleland offset relation to the main body of the plate or at substantiallyright angles thereto. The most common way to fasten the flanges to thewood supporting blocks has been by the use of tacks or nails which weredriven through the flanges into the edges of the block to thereby securethe plate in place.

The flanging arrangement referred to is open to the objection that asubstantial amount of time is required to fasten a plate to a block andthat it is diflicult to remove the used plate and secure another platein its place. In addition, the use of two flanges has not been whollysatisfactory in that the lateral sweep of the printing and the inkingrolls tends to lift one of the free edges of the relatively flexibleplate and thereby permit ink to accumulate under the edge of the plateand to otherwise interfere with a printing operation.

It is the obiect of my invention to provide a flanged printing platewhich will be free from the objections referred to.

I have discovered that by providing a printing plate of the general typedescribed with flanges having an inwardly converging relation to eachother, and making use of a supporting block having grooves formed toreceive the flanges in an interlooking or dove-tailed relation, anarrangement is secured by which a plate can be attached to or removedfrom a supporting block with a minimum expenditure of time and trouble.

In the drawings:

Fig. 1 is a view in perspective of a flanged printing plate embodyingthe invention.

Fig. 2 is an end view of the flanged plate shown in Fig. 1.

Fig. 3 is a view in perspective and partly broken away of a flangedplate mounted on a special supporting block.

Fig. 4 is a transverse sectional view of the mounted plate shown. inFig. 3.

Referring to the drawing, there is shown in Fig. 1 a printing plate 1.formed of celluloid or other sheet material and provided along threeedges with inwardly directe'l flanges 2. Preferably, the angle whicheach flange makes with the body of the plate ap proximates forty-fivedegrees, but it will be obvious that different degrees of augularity maybe utilized so long as there is inward inclination from a right angledposition. It will be clear also that the flanges may be provided withcurves or corrugations or other formations designed to provide a lockingconnection with a suitable supporting block.

In Fig. 3 of the drawing there is shown a printing plate provided withinwardly inclined flanges such as have been referred to. the plate beingmounted on a supporting block 3 provided near three of its edges withinwardly directed grooves 4 into which the flanges 2 on the plate 1 maybe snapped to thereby hold the plate in immovable re-; lation on theblock during the operation of printing. It will be seen that thefurniture or blocks may be formed in different columnar widths and ofany desired length, and that standard widths of blocks may be keptpermanently on hand on which new plates may be substituted for old onesfrom day to day or as often as required.

I find that by providing flanges along three edges of the plate, insteadof along only two opposite edges, as in the old prac tice, aconstruction is secured which is effective to prevent the lifting of anedge of the plate by the lateral sweep of the print ing members. Thisovercomes a serious defeet in plates of this general type known. n theprior art in which the action of the press lifted an edge of the plateintermediate the flanges and not only permitted the deposit of inkthereunder but which Was also a frequent cause of distortion and even 5breakage of the plate.

W'hatI claim is:

A printing plate formed of flexible nonmetallic sheet material andhaving flanges formed at an acute angle to the body of the plate alongthree edges thereof, in combination with a supporting block for theplate having inwardly directed grooves formed to receive said flangesand have supporting engagement with both surfaces thereof.

FREDERICK C. GOLDENBAUM.

